Brawling, though mostly involving skill, also incorporates character vs character advantages/ disadvantages. This means that some character's are just good against an other. For example, i know lucas is good against falco. This does not means that it is impossible to beat a lucas with a falco, but the falco player needs to play alot more skillfully to beat the lucas. I will try to figure out these statistics soon and post them here. These are based on my personal experiences. But if u have anything to add or comment, feel free.
So far...... (there may be more than 1 for certain characters)
Weakness
Falco:------Lucas
Pikachu:----Metaknight
Metaknight:-----Pokemon Trainer
Pokemon Trainer:-----Lucario
Captain Falcon-------Lucario/Fox